P2501high severityPowertrain
Generator Lamp/L Terminal Circuit High
on 2012 Tesla Roadster Single Motor RWD · RWD
What this code means
High signal on alternator exciter circuit.
Symptoms
- Battery light behavior abnormal
- Overcharging possible
- Check engine light
Common causes
- Short to voltage in exciter wire
- Voltage regulator fault
- ECM communication issue
Diagnostic steps
- Measure exciter circuit voltage
- Check for shorts to power
- Test alternator output
Repair notes
Repair wiring or replace alternator.
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